Rotary pump



A g- 2 1 G. E. ROBERTS 1 172 49 ROTARY PUMP Filed Jan. 20. 1928 22 o G.E.Rob,erts

Patented Aug. 12, 1930 a UNI E TA PATENT OFFICE,

LGEORGE E. .ROBER'IS, 0F ELKHORN, NEBRASKA Wv im -i jgf im m filed January 20, 1'9 2a. Serial no; 248,099.

This invention relates to rotary pumps and has'for its principal objectto provide a means whereby liquidsand particularly heavy oils may be pumped with the minimum of manual effort;

Another object of the invention is to provide a devicewof few and simple parts so that manufacture'will be economical and the device will be comparatively durable without replacement of worn parts.-

Other objects and advantages will be apparent from the following detailed description in which:

Figure 1 is a side view of the new device with its cover or face-plate removed, parts being broken away and in section. V

Figure 2 is a vertical sectional view taken along the dotted line 22 of Fig. 1, with a handle applied to its shaft, and;

Figure 3 is a top plan view of a fragmenshowing a piston applied thereto. 7 Referring-now tothe drawing for 'a more particular description in which like parts 7 are denoted by like or corresponding numerals of reference throughout the several views, the numerallO indicates a housing preferably providedwith an annular flange 11, and a bushing .12 within which one end of a shaft 13 is journalled. The face-plate 14 is sim1- larly provided with a removable and replace able bushing 15 adapted to provide a bearing for the shaft 13. Theface-plate 14 is secured to the housing 10 in a removable manner by any suitable means such as the stud bolts 16, best shown in Fig. 1.

Upon one end of the shaftl3, I provide a handle 17 for the manual propulsion of the later described parts, it being understood that,- at desired times, a grooved or plain pulley may be substituted for the handle 17 in instances where it is desired. to operate the pump by means of a motor, engine or other suitable source of power other than by hand.

As best shown in Fig. 1, the shaft 13is preferably located centrally of the device and upon said shaft and secured thereto by any suitable means such as the splined keys. 18,

I mount a cylinder block 19. The cylinder cylinders are located for purposes later described. tary portion or segment of a cylinder member a tank cape of said 'oil from a closing. It. is understood block'19is 'drical recesses 20, the preferred number of "being 4:. The cylindricalrecesses areprovid'ed with slots 21'upon opposite sides of the cylinder block; IVithin each cylindrical recess I provide pistons22 adaptedto have reciprocating motion by Ineans'later described. Each1piston 22is provided with anti-friction rollers 23 mount- "ed" upon their wrist-pins je'cting outwardly from surfaces '22 24', said pins prothe fiat segmental othe'r'upon' opposite sides ofthe pistonswall. Therollers 23 are adapted'toextend beyond the side wallsof the" cylinder blockand be provided witha plurality of cylin which are parallel witheach received withinthe grooves 25 formed within:

the walls of the face-plate 14 and housing 10. The grooves 25, as best shown in Fig. 1,

eccentric with respectto the shaft "The housing 10 provides a segmental inan inlet pipe'or similar conduit 27. The pipe 27 is incommunicat-ion at alltimeswith or other container not shown.

A conventional check-valve, not shown, is preferably placed in the pipe27 closely adjacent to its mouth and to the reservoir 26. The function of 'the check-valve is to permit. oil to flow through the pipe 27 towards the reservoir by opening and to prevent the es- 7 the reservoir and through the-pipe 27 bymeans of-said valve 7 that the tank may be ata remotedistancefrom the device such as being buried under'the ground about filling v stations or other oil dispensing depots.

Upon the side of the device opposite to the reservoir 26, I provide an outlet duct 28 which is in communication at all times with a pipe 29, said: pipe 291leading to a suitable point: for dispensing the liquids. I :The device maybe supported abovethe level of such as its legs 30.

the ground by any suitablemeans Aswbest shown in Fig. 1, during rotary movements of the cylinder block, its perimeter or outer edge will have bearing against or tea projection 1 be positioned closely adjacent take reservoir 26 upon. one sideofthe device whlch isin communlcation at all times with or cut-off 31 of the flange 11. It will be noted that since the annular segmental length of the flange 31 is greater in distance than the diameter of the pistons 22 that the projection 31 will function as a cut-off for preventing communication between the reservoir 26 and the outlet passageway 28.. Likewise, I provide a, projection 32 preferably diametrically opposite to the projection 31 which has a similar function. i

In operation, the c linder block 19 is rotated in the direction of the arrow 33 and referring to the piston which isadjacentthe projection 32 in Fig. 1,"t will be noted that it is at the end of its discharge stroke and that when it comes in alignment with the inlet pipe 27 and enters the area of. the reservoir 26 that it will start an intake stroke by reasonof the fact that its rollers 23, which are in. contact at alljtimes within their grooves 25, will cause the piston to move towards'the shaft 13 since the grooves are formed eccentrically with respectto said shaft. The said piston during. its above described movement will cause the liquid in the reservoir 26 to load or fill its cylinder during its intake stroke, which is completedv when 7 the piston reaches a position adjacent thepro- .stroke by reason of the fact that the grooves jection 31. :After passing the projection 31,

the piston will becaused to start a discharge 2-5 diverge outwardly away from the shaft 13 completed its aid being forced into the duct 28 and pipe 29. As the liquid be'comes removed from the resthereby causing a tit-ion to provide between or thepartitions intake and .bersya shaft centrally mounted in the housat said time. lVhen the piston again reaches the position adjacent theproject-ion 32, it has discharge stroke, the oil or liqervoir 26, a partial vacuum-will beicre'ated in said reservoir 26 and the inlet pipe 27, suction of the liquid from its source of supply or the above mentioned tank. The other pistons operate similarly to the one above described and are but a multiplethereof. r

v In order to relieve back pressure from the pistons- 22,'at their sides nearest thefshaft 13,

shown in Fig. 1, establish communication between all of the cylinders in a manner whereby air or liquid contained in the cylinders and upon the sides of the pistons nearest the Iclaini as my invention 1- A rotary pump, comprising a housing hav- 'in'g inlet and outlet openings in one side I separated by apartition extending inwardly from the peripheral wall of the housing, said housing-having a second partitionextending inwardly from said peripheral wall and dising and adapted to be turned, a solid cylinder block mounted on the shaft to turn therewith and fitting between the inner ends of said partltions, said cylinder block having radially dlsposed cylinder openings therein opening through the peripheral face of the block and havmgradial slots in the opposite sides of the block opening into said cylinder openngs, and pistons fitting in the cylinder openlugs and having pins projecting through said radial slots and beyond the sides of the block, sald housing having annular grooves in its opposite inner flat walls for the reception of said pins, said grooves being eccentrically offset from the shaft'toward said inlet and outlet openings, and said cylinderblock having passages therein interconnecting the inner ends of the cylinder openingsto relieve pressure against the inner ends of the pistons.

GEORGE E. ROBERTS.

I provideby-pass ducts 3a which, as best posed substantially oppositetto said first par- I exhaust chamthe opposite sides I 

